<template>
  <div>
    <div class="home-page">

  <div class="banner">
    <div class="container">
      <h1 class="logo-font">conduit</h1>
      <p>A place to share your knowledge.</p>
    </div>
  </div>

  <div class="container page">
    <div class="row">

      <div class="col-md-9">
        <div class="feed-toggle">
          <ul class="nav nav-pills outline-active">
            <li v-if="user" class="nav-item">
              <nuxt-link class="nav-link" :class="{
                active: tab === 'your_feed'
              }"
              exact
              :to="{
                name: 'home',
                query: {
                  tab: 'your_feed'
                }
              }"
              >
                your_feed
              </nuxt-link>
            </li>
            <li class="nav-item">
              <nuxt-link class="nav-link" :class="{
                active: tab === 'global_feed'
              }"
              exact
              :to="{
                name: 'home',
                query: {
                  tab: 'global_feed'
                }
              }"
              >
                Global Feed
              </nuxt-link>
            </li>
            <li v-if="tag" class="nav-item">
              <nuxt-link class="nav-link" :class="{
                active: tab === 'tag'
              }"
              exact
              :to="{
                name: 'home',
                query: {
                  tab: 'tag'
                }
              }"
              >
                #{{tag}}
              </nuxt-link>
            </li>
          </ul>
        </div>

        <div class="article-preview">
          <div v-for="article in articles" :key="article.slug" class="article-meta">
            <nuxt-link :to="{
              name: 'profile',
              params: {
                username: article.author.username
              }
            }">
              <img :src="article.author.image" />
            </nuxt-link>
            <div class="info">
              <nuxt-link :to="{
                name: 'profile',
                params: {
                  username: article.author.username
                }
              }" class="author">
                {{ article.author.username }}
            </nuxt-link>
              <span class="date">{{ article.createdAt | date('MMMM D, YYYY') }}</span>
            </div>
            <button class="btn btn-outline-primary btn-sm pull-xs-right"
              @click="onFavorite(article)"
              :disabled="article.disabled"
            >
              <i class="ion-heart"></i> {{ article.favoritesCount }}
            </button>
            <nuxt-link :to="{
              name: 'article',
              params: {
                slug: article.slug
              }
            }" class="preview-link">
              <h1>{{article.title}}</h1>
              <p>{{article.description}}</p>
              <span>Read more...</span>
            </nuxt-link>
          </div>
        </div>


        <nav>
          <ul class="pagination">
            <li class="page-item"
            :class="{
                active: item === page
              }"
             v-for="item in totalPage" :key="item">
              <nuxt-link 
                class="page-link"
                :to="{
                  name: 'home',
                  query: {
                    page: item,
                    tag: $route.query.tag,
                    tab: tab
                  }
                }" 
              >
              {{item}}
              </nuxt-link>
            </li>
          </ul>
      </nav>
      </div>

      

      <div class="col-md-3">
        <div class="sidebar">
          <p>Popular Tags</p>
          <div class="tag-list">
           <nuxt-link :to="{
             name:'home',
             query: {
               tag: item,
               tab: 'tag'
             }
           }" class="tag-pill tag-default" v-for="item in tags" 
           :key="item" >{{item}}</nuxt-link>
          </div>
        </div>
      </div>

    </div>
  </div>

</div>
  </div>
</template>

<script>
import { getArticles, getFeedArticles, addFavorite, deleteFavorite } from '@/api/article'
import { getTags } from '@/api/tag'
import { mapState } from 'vuex'
export default {
  name: 'HomeIndex',
  watchQuery: ['page', 'tag', 'tab'],
  async asyncData({ query, store }) {
    const limit = 20
    const page = Number.parseInt(query.page || 1)
    const { tag } = query
    const tab =  query.tab || 'global_feed'
    const loadArticles = store.state.user && tab === 'your_feed'
    ? getFeedArticles
    : getArticles
    const [articleRes, tagRes] = await Promise.all([
      loadArticles({
        limit,
        offset: (page - 1) * limit,
        tag
      }),
      getTags()
    ])

    const { articles, articlesCount} = articleRes.data
    const { tags } = tagRes.data

    articles.forEach(article => {
      article.disabled = false
    });
    return {
      articles,
      articlesCount,
      tags,
      limit,
      page,
      tag,
      tab
    }
  },
  computed: {
    ...mapState(['user']),
    totalPage(){
      return Math.ceil(this.articlesCount / this.limit)
    }
  },
  methods: {
    async onFavorite (article) {
      console.log(article);
      article.disabled = true
      if (article.favorited) {
        await deleteFavorite(article.slug)
        article.favorited = false
        article.favoritesCount += -1
      } else {
        await addFavorite(article.slug)
        article.favorited = true
        article.favoritesCount += 1
      }
      article.disabled = false
    }
  }
}
</script>

<style>

</style>